Filter cartridge



Aug. 14, 1951 c. B. cHAsE FILTER CARTRIDGE Filed rgb. 2s.l 195o Patented Aug. 14, 1951 FILTER CARTRIDGE Charles' B. Chase, Seekonk, Mass., assigner to Fram Corporation, a corporation of Rhode Island Application February 23, 1950, Serial N o. 145,878

This invention is a continuation in part of my application Ser. No. 37,675, dated July 8, 1948, now abandoned, and relates to a lter for uids and is concerned more particularly with the element through which the fluid passes.

In the use of ilters of this general type in which there are cells provided for collecting contaminant which is filtered from the fluid, various means have been utilized in the construction of the lter for the formation of cells, usually resulting in the cutting of a multiplicity of separate lter webs and spacers in appropriate shapes to be built-up such as by stacking one upon the other to provide a filter ofgenerally rectangular or cylindrical overall construction for the use which they are to perform.

One of the objects of this invention is to provide a filter which will be of simpler construction and one which may be more easily and simply formed.

Another object of this invention is to provide a construction of paper in which there will be a minimum amount of cutting of the paper in its formation. v

Another object of this invention is to provide a construction from web-like material in which there will be a minimum of waste of the material.

Another object of the invention is to provide a construction in which there will be a maximum of usable area of filter material for the weight of material used.

Another object oi the invention is to provide a maximum ltering surface within a cylindrical unit and yet a structure which will be of strong construction and withstand the pressures to which the same may be subjected.

With these and other` objects in view, the invention consists of certain novel features of construction, as will be more fully described and particularly pointed out in the appended claims.

In the accompanying drawings:

Fig. 1 is a sectional view showing dilerent parts broken away for the better illustration of the construction of the lter element;

Fig. 2 is a perspective view showing the filter element partially uncoiled for better illustratin its construction;

Fig. 3 is a sectional diagrammatic view illustrating the flow line of the ltrate through the element;

Fig. 4 is a sectional view on line 4 4 of Fig. 1; In proceeding with this invention, I spirally coil two generally parallel webs of ltering material such as paper. Means are provided to space each convolution from the previous con- (Cl. 21o-169) both ends of the 'coil for providing a space between the ends of the coil and the end walls of the shell. Openings in the shell are provided to lead into the space at one end of the shell while a space is provided for the uid to pass from the chamber at the other end of the shell' into a filtrate discharge conduit. This shell serves as a cartridge which may be inserted into the lilter case for receiving iluid in` the vcase and directing it to a discharge therefrom.

With reference to the drawings, I0 designates a lter case having a cylindrical side wall Il with a generally bulbous bottom wall I2 from which there extends upwardly a. center tube I3 having an internally threaded connection I4 for a drain conduit to be attached thereto. This center tube I3 has openings into it at I5 so that when liquid getsv to the level of the opening I5 it will pass into and down through the center tube I3. internally threaded as at I6 to receive a screw I'l which is headed as at I8 to engage a washer I 9 and hold the cover 20 onto the cylindrical casing II. This cover is anged as at 2I and receives a gasket 22 between the top of the cover and the casing. A boss 23 extends outwardly from the cylindrical wall Il of the casing and is internally threaded as at 24 to provide an inlet opening into the casing. A drain plug 25 is threaded into an internally threaded boss 26 vi'or draining such contaminant material as may settle into the sump 21 formed by the bulbous n bottom wall of the casing.

A nner element su is meatd within the casing and is in the form of a cylindrical cartridge which may be easily positioned in the casing when the cover 20 is removed, or removed therefrom for replacement as the same collects contaminant from the fluid to be filtered.

This element 30A consists essentially of a tubular core 3| about which there i`s spirally coiled a pair of webs of lter material 32 and 33 (see Fig. 2), such as paper or paper treated with a chemical. These websrare spaced from each other by The upper end of this center tube is.

access? some sort of a roughened piece of web material 34 which may conveniently be corrugated sheet aluminum which will serve to permit fluid or liquid to pass axially of the coil between the surfaces of the filter material 32 and 33. At one end 33 of the coil and sandwiched between the margins of the webs 32 and 33 there is a sealing strip 35 so that as the webs are coiled the strip 35 will seal between the webs 32 and 33 and will prevent the passage of fluid into or from this end of the cell formed between the strips 32 and 33.

As the webs 32 and 33 are coiled, a strip 38, hav-l ing a corrugated or roughened surface such as serrated or corrugated aluminum and of a narrow width, is located adjacent the end 38 of the coil of webs so as to space the edge of the web 33 from the previous convolution of web 32 and provide a cell between the convolutions of the pairs of webs as they are coiled. At the opposite end 33 of the coil, a sealing strip 40 is sandwiched between the convolutions of the parts of webs 32 and 33 as they are coiled so as to provide a seal between the web 33 and the previous convolution of the web 32. The sealing strips 35 and 40 may be of soft paper or cardboard and secured in place by tightly rolling to form a seal, or they may be glued along their surfaces or at a portion of their surfaces to tack them in place as the webs are coiled. The core 3| extends beyond the ends of the coil and will usually be formed of some sort of sheet metal. The spacing is omitted from the outer convolution of the coil so that a soft outer surface is provided to fit the shell'tightly and seal the ends of both spaces between webs.

The element as above described is positioned within a cylindrical shell 42 having a bottom end wall 43 between which and the coil there is a spacer positioned comprising a plate 44 with fins 45 extendingv radially outwardly and which may be of any number so as to space the end 39 of the coiled webs from the bottom wall and provide a collecting chamber 45 -for fluid, which collecting chamber will communicate with the center of the core 3l at the end thereof. The coil of web material will fit tightly within the shell 42.

The opposite end 38 of the coil of webs is spaced from a top wall 50 and in cases where the cartridge is to remain substantially vertical with the inlet of the cartridge tending to force the coil downwardly, no means need be provided for spacing the cartridge from this end wall, although in some cases such spacing means may be desirable. This end wall is perforated as at I so that fluid to be filtered may enter this shell freely into the space chamber 53 provided at the upper end for this fluid. This shell thus provided has an opening through it and will be positioned within the casing I0. It will be spaced from the bottom wall by means of a stool or spacer 54 upon which there rests a soft gasket 55 to engage the bottom wall 43, while at the upper end there is a gasket 55 to engage the top wall 50. A spring 5l will force this gasket and the cartridge 30 downwardly to provide a good seal between the cartridge and the center tube I3 which extends through it.

In operation, the fluid to be filtered will enter the inlet at 24, fill the space between the cartridge 3l and the casing III. Such heavy contaminants as may be in the fluid will settle out in the sump 2l. Some pressure is provided upon the fluid to be filtered and it will enter the openings 5I, into the chamber 53, and then pass into the cell 5I formed by means of a spacer 35 and pass through the webs 32 and 33 into the cell 52 formed between the webs 32 and 33, leaving a deposit in the spiral cell 6I of the contaminant while the filtrate fluid passes downwardly in the spiral cell 52 into the chamber 45 thence into the hollow core 3I to rise in this hollow core to the level of the opening I5 and thence downwardly in the center tube I3 and outwardly from the filter case.

By this arrangement, a large amount of filter surface is provided upon which contaminant may collect and a very fast flowing filtering means is provided in which there is little restriction to the filtrate. As soon as the contaminant space is filled with contaminant, the cartridge, including the shell, will be removed and replaced by a fresh one. As a large amount of contaminant space is provided, the change may be infrequent.

I claim:

y 1. A filter element comprising a pair of spirally coiled webs of filter material spaced from each other providing a first spiral space and with the convolutions spaced providing a second spiral space, an impervious strip between the marginal edges of said webs throughout their length at one end of the coil to block the passage of fluid to or fromthe first said spiral space, and an impervious strip between the marginal edges of said webs throughout their lengths at the other end of the coil to block the passage of fluid to or from the second said spiral space, a corrugated sheet of material between said webs in the first said space throughout the major portion of said space and a corrugated narrow strip in the second said space between said webs and at the marginal edges thereof maintaining said spaced relation, whereby fluid to be filtered may enter the second spiral space at one end of the coil, pass through the filter web into the first space and be discharged therefrom at the otherend of the coil.

2. A filter element. as set forth in claim 1 wherein said corrugated sheet' is of metal.

3. A filter element as set forth in claim 1 wherein said corrugated sheet is of aluminum.

CHARLES B. CHASE.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,644,728 Jahnke Oct. 11, 1927 1,742,768 Kamrath Jan. 7, 1930 1,791,046` Sweetland Feb. 3, 1931 2,210,397 Dreiss Aug. 6, 1940 2,321,985 Briggs June 15, 1943 2,427,862 Judkins Sept. 23, 1947 2,472,012 Hanneman May 31, 1949 FOREIGN PATENTS Number Country Date 880,486 France Mar. 6, 1943 

